Liquid and gaseous fuel carburetor



April 25, 1939. LAUB y .7 2,155,763

LI 'QUID AND GASEOUS FUEL CARBURETOR Filed Nov. 11, 1936 2 Sheets-Sheet 2 Patented Apr. 25, 139 g I v i Q 2 155 7 3 I OUBYFUEL CAjRBURETOB .-Laub, Lo c Ahgeles,-Oalif.', assignorj toEn- I signCiI-r u ter Ltd; Huntinxto'nlark, .Qaiij.,-a corporation oicailtornia= V, Application November 1I,i1936, 8erial-No. 110,241 q .0mm (curiae i This invention pertains ltocarburetingappa- Fig: 215 a vertical section on line 2-2 01 ratus for internal combustion engines, and has -Fig.'1;- I 1 1 v: for its general purpose to provide an improved Fig. 3is a horizontal section. through the gas a carburetor capable of operating on either liquid noazle on Iine'MofFlg; -1; and a f 1 '5 or gaseous-fuel, and to provide a simple and Fig. 4 is a ifragme'tary section'showing the 5 practical means for adapting variousstandard normal relationshipbetween certain parts oi the or commercial liquid fuel carburetors for operagasoline carburetor before insertion d. the gas tion on gas. a; t v'nozzlebetween the'body sections. I Within recent years theincreasing 'develop- In the drawings, I' have 'showm the inventio 10 ment andmanuiacture oi certaintypes 01. norincorporated in -a ypicaland known form of lo mally gaseous fuels 'havemade: it'advantageous gasoline carburetor, for thepurposepi' illustratin many instances to use such fuels in prefer- :ing an embodiment oi'the general combination,

particularly true as regardsthe -socalled liquid also to illustrate the adaptability of the invention 1 petroleum gas," :recovered; byabsorption and V to gasoline carburetors in generalto equip them fractionation from natural gas and consisting of ioroperation ongaseous fuel, WhileIhave shown is highly satisi'actoryforathe operation ofiinthe invention is also and equally well'adaptable 20 cause of lower cost and availability. When fed construction permitting insertion of the gas supto thevcarburetor the iueljis in gaseous form, ply nozzle, 5: a having been vaporized mainly by reducing its Referring first to Figs. 1 and 2, the gasoline 25 pressure, although usuailyit is subjected to low A carburetor comprises a body including sections temperature heating to insure complete vapori- II), II and l2, sections it and II being cona p 3 nected by screws l3, and sections lland l2 nor- Instead of building a carburetor capable of opmany, that is before insertion of the gas nozzle eratlng on gaseous iuel -alone, it, is preferable in H, being heldltogether by screws applied to 30 gasoline carburetors already in use, or galsoiine .dicated at I8, increases to a maximum cross sec- 35 carburetors of standardmanufaeture, to operate tional area at l9 within the upper interior of on gaseous fueL- In accordance with the invenintermediaterbodyl section "I Landbelow the ention. I haveprovided a simple .andgenerally larged section- Iii-the suction passage isdivided applicable means of converting standard gasoline into separate parts by the tubular walls or vertbinition claimed; a trated dual arrangement. a I

The invention will be more fully explained g -Gasoline is drawn intothe suction passage of and understood to best advantage from the 101- the carburetor through nozzlesu dis a lowing detailed descriptionof a typical and illusinto Venturi tubes 23 positioned inv axial alin trative form of carburetor embodying the invenment with the circulareross sectional passages 50 tion. Reference is hadthroughout the 'des'crip- 2lla within tubesjfl. As will be apparent, pasni l' t m f cerbure ins a paratus embody discharged from the venturis 23, with the main ing the invention;, 7 a g a p I air stream flowin into the upper end of 55 fully illustrated and terminal connections.

itself and show, typically, a justable valve 54 threaded in 28 around the venturls 28. It will suffice to state without describing or illustrating in detail all parts of the gasoline carburetor, 'that the liquid fuel is supplied to nozzles 22 from theusual float chamber lld contained in the intermediate body section II; Also that a common type of manual adjustment generaly indicatedat 25, and as more explained application, Ser. No. 102,718, flied September 26, 1936, on Carbureting apparatus, may be provided for shutting off the gasoline supply to the carburetor while the latteris operating on gaseous fuel, as hereinafter explained.

Lower bo engine manifold inlet 21, contains the usual throttle valves 28 carried on shaft lt'passages 88 being continuations of the vidual suction passages a formed within. body section N. Fig. 4 illustrates the normal reia-' tionship or relativepositions ofbody sections and I2 of the gasoline carburetor before insertion of the gas supply nozzle i4. The'lower portions of tubes 20 normallyextend downwardly within passages 30, fitting the; bore walls 3| forming these passages. operated by rod 33 connected to arm 34 of ball crank 35 carried on the throttle shaft .28, the

.choke valve 16 also being manually controlled by rod 88 connecting with arm 31 having-anopcrating connection. at 38 with arm 39 onthe choke shaft ll. The throttle and choke valve mechanisms. are interconnected by the usual rod or linkage 40, the purpose and eifect of which is known to those familiar with the art and requires no specific explanation. The illustrated type of carburetoralso has an accelerating fuel pump lever 4| operatively connected with arm. on the throttle shaft by means of rod 43 In the gasoline carburetor, rods 40 and 43 ordinarily are single piece members as shown at 40' and 43 in Fig. 4, and the only purpose of illustrating them herein, .18 to explain that in order to accommodate the gas nozzle I4, which,- when inserted between the body sections; lengthens the distance between the. terminal connections with rods 40 and 48, the latter are severed and the sections are connected by splicers 45- and 48 which permit proper adjustment of the rod lengths to correspond withthe increased spacing of their The gas supply. nozzle I4 is shown typically as comprising a body 48 of-uniformthickness inserted between the carburetorsections i2 and clamped between flanges Ho and |2a by screws 49 body as illustrated in Fig. 3 Body 48 contains a gaseous fuel passage 5| towhich the gas is supplied through line 52 leading from a pressure regulator conventionally illustrated at 53in Fig. 1, and operating to deliver gas? to the'nozzle passage at substantially constant pressure, preferably atmospheric or slightly below atmospheric pressure.

The flow of per se are well known. gas through passage 5| may be manually regulated by -suitable valve means between the regulator outlet and thecarburetor suction passage. Preferably I provide the flow regulating valve in the nozzle longitudinally adthe body at 55, the inner cylindric end 54a of the valve extending across the passage bore 5| and within a transverse bore 56 of slightly larger diameter than the 75 valve portion 54a.

in my copending dy 'section I! connected Bit/:2 to the" 28, permitting th mixing or indi' passage. 'The throttles 28 are i shut off, and, vice shut off either by Hand passing through holes inthe nozzle A conventional showing of the gas pressure regulator will suffice since such devices aromas Beyond the valve, the gas passage progressively increases in size at ila toward the outlets 51, the latter being formed by intersecting bores 51a in the bottom wall 48a of the nozzle body. The top wall 48b of the body (see Fig. 2) has corresponding bores 58 in vertical alinement with bores 51 to receive the gasoline carburetor mixing tubesill. Separate portions of the gas stream are deflected by 'a' vertical web or'baiile 60 extending between the top and bottom walls 48b and 48a of the nozzle body, toward the annular outlets 51. The side vand end walls 480. and 48d of thefrom the outside of tubes gas streams flowing from pasnozzle body are spaced "-sages 5|ato enter spaces entirely surrounding the tubes except at web 2|, and to be drawn through inletsfl51a into the suction passage by virtue. of the velocity of the air streams leaving the mixing tubes. By providing spaces substantially' surroundlngthe tubes, and into whichthe gas is fed, the gas is caused :to flow uniformly around the entire'peripheries of the bottom open ends of the-tubes, as itxis taken into the suction With the car uretor thus equipped to supply combustible mixtures of gasoline or gas, the engine may be operated selectively on either. fuel. Whenoperating on gas supplied through 'nozzle l4, the gasoline supply to the carburetor will be. versa, the gas supply will be closing-valve 54 or some other valve (notshown) in thegas supplysystem, when the carburetor is operating ongasolinerAs will be apparent, the engine may be startedusing either type of fuel and a change to-the other fuel effected while the engine is running. vHowever, the main purpose of providing both liquid and gaseous fuel supply means in a single carburetor,

is to render the carburetorcapableof operating It may be mentioned that the gas nozzle body -48 may in some installations contain liquid fuel passages, depending upon the type and construction of the carburetor in which the nozzle is inserted, to permit normal functioning of the carburetor'when operating in liquid'fuel. To illustrate, the carburetor is shown in'Fig. 1 to have the usual idlingby-pass' passages 63 and 65, 88 infthe walls of body sections |2 and respectively, the discharge of fuel from passages 88 into the suction passages being controllable by needle valves 82. Provision is made for maintainin .t' e continuity of'thse idling fuel passages after insertion of the gas nozzle by drilling passages 54, see Fig. 3, that register with passages 63 and 65 in the carburetor. V

I claim: 1

I. A carburetor having pair of spaced sections containing a suction passagegventuri means in one of said sections restricting the suction passage, said suction passage being less restricted within the other'of said sections, a throttle i'n'the last mentiond section and an outlet beyond the throttle in the direction of air-flow through said passage, a tubular suca body comprising a tion passage wall projecting from the endof said Venturi containing section, means for supplying liquid fuel to the suction passage withinsaid Venturi containing section, a, gas fuel supply nozzle surrounding said wall and removably insertecl between said body sections, said nozzle comprising walls spaced axially of said suction passage wall and forming between them a gas passage, and the suction passage wall forming with the nozzle a gas outlet slot discharging into said suction passage between the Venturi means and the throttle. v

2. A carburetor having a body comprising a pair of spaced sections containing a suction passage, Venturi means in stricting the suction'passage, said suction passage being less restricted within the other of saidsections, a throttle in the last mentioned sectionand an outlet beyond the throttle'in the direction of air flow through said passage, a tubular suction passage wall projecting from the end of said Venturi containing section, the throttle containing section having a bore into which said tubular wall maybe inserted, means for supplying liquid fuel to the suction passage within said Venturi containing section, a gas fuel supply nozzle surrounding said wall and removably inserted be tween said body sections, said wall forming with the nozzle a gas' outlet slot discharging into said suction passage between the Venturi means and the throttle.

3. A carburetor having a body comprising a pair of spaced sections containing a suction passage, Venturi means in one of said sections re-v stricting the suction passage, said suction passage being less restricted within the other of said sections, a throttle in the last mentioned section and an outlet beyond the throttle in the direction one of said sections re- 3 of air flow through said passage, a pair of tubular suction passage walls projecting from the end of said Venturi containing section, means for supplying liquid fuel to the suction passage within said Venturi containing section, a gas fuel supply nozzle removably inserted between said sections and having a pair of bores surrounding and spaced from said suction passage walls, said nozzle comprising a gas inlet, and walls spaced axially of said suction passage walls and forming between them a gas passage discharging into the spaces between the nozzle and said suction passage walls between the Venturi means andthe throttle. j

4. Acarburetor having a body comprising a pair of spaced sections containing a suction passage, Venturi means in one of said sections restricting the suction passage, said suction passage being less restricted within the other of said sections, a throttle in the last mentioned section and an outlet beyond the throttle in the direction of air flow through said passage, a pair of tubular suction passage walls projecting from the end of said Venturi containing section, means for supplying liquid fuel to the suction passage within said Venturi containing section, a gas fuel supply nozzle removably inserted between said sections and having a pair of bores surrounding and spaced from said suction passage walls, said nozzle comprisinga gas inlet, walls spaced axially of said suction passage walls and forming between them a gaspassage discharging into the spaces between the nozzle and said suction passage walls said spaces. a

" FRED N. 

